Like mr. tada , who studied construction in technical school , many of the workers are lightly educated .

与曾在技校学习过建筑的多田贤治一样，很多工作人员的学历并不高。

Mr. tada is in a group of semiskilled workers who hover somewhere in the middle of japan 's nuclear power-plant ecosystem .

多田贤治是一群半技术工人的一员，他们处于日本核电站生态系统的中层。

That is less than the 190 microsieverts mr. tada says he logged in four hours of work one recent day , before the crisis .

他说，最近在危机前的一天，他工作四个小时记录的辐射量是190微西弗，比现在高。